Deleting source footage to make space?

So, long story short, I split my latest project up into several parts that were then exported at a pro res resolution, to be thrown into one large, final project. Those pro res files are HUGE. Like, 50 gb huge. Now, I have less then 10 gb on my mac book pro, and I was wondering if I could delete the source files without the final product (already exported) losing data.